Freiburg 2024 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 20: Quantum Many-Body Dynamics
Q 20.5: Talk
Tuesday, March 12, 2024, 12:00–12:15, HS 3118
Quantum state preparation via engineered ancilla resetting — Daniel Alcalde Puente1, Felix Motzoi1, Tommaso Calarco1,2,3, Giovanna Morigi4, and •Matteo Rizzi1,2 — 1Institute of Quantum Control, Peter Grünberg Institut (PGI-8) - Forschungszentrum Julich GmbH, Jülich, Germany — 2Institute for Theoretical Physics - University of Cologne, Köln, Germany — 3Dipartimento di Fisica e Astronomia - Universita di Bologna, Bologna, Italy — 4Theoretical Physics - Saarland University, Saarbrucken, Germany
In this study, we investigate a quantum resetting protocol for preparing ground states of frustration-free Hamiltonians. The protocol uses a steering Hamiltonian for local coupling to ancillary degrees of freedom, which are periodically reset. For short reset times, the dynamics resemble a Lindbladian with the target state as its steady state. We use Matrix Product State simulations and quantum trajectory methods to assess the protocol's efficiency in preparing the spin-1 Affleck-Kennedy-Lieb-Tasaki state, focusing on convergence time, fidelity, and energy evolution at various reset intervals. Our findings indicate that entanglement with the ancillary system is crucial for rapid convergence, with an optimal reset time for peak performance. The protocol also demonstrates robustness against small deviations in reset time and dephasing noise. Our results suggest that quantum resetting could be more advantageous than other methods like quantum reservoir engineering in certain contexts.
Keywords: Quantum State Preparation; Quantum Steering; Measurement; Matrix Product States; Quantum Trajectories